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Treatment of sewage sludge through vermicomposting using Eisenia fetida

As a consequence of population explosion, economic development and large scale urbanization, huge quantities of solid and liquid waste materials are produced in India. Their disposal and management are difficult and cumbersome tasks which are associated with serious environmental and health problems. Sewage water and sludge is released in large drainages called nallah from where the sludge is collected and disposed off in agricultural fields, open dumps, along the roadside or railway tracks and poorly designed sanitary land-fills which can pollute surface or ground water causing public health hazards.Nowadays, vermicomposting is attracting much attention as a method of management of organic waste including sludge stabilization worldwide due to its simple technology and lack of need for expensive equipments. This has also been recommended for increasing soil fertility, detoxication, organic farming and sustainable agriculture. In the present study it has been observed that in a mixture of sewage sludge, cattle dung and rice husk vermicomposting earthworms, Eiseniafetida survive, reproduce and the population and biomass of different and suitable mixture.